I was using Pdguru's French line infantry re-texture and I noticed a very immersive side effect!
The line infantry with the added chevrons (from the upgraded building) had the re-textured 'On-campaign' look, While the raw recruits (without chevrons) still retained their vanilla look.
I thought it was awesome that the veteran troops had a rough look while the recruits didn't!
Just a thing to try out if anyone cares
http://www.twcenter.net/forums/showthread.php?t=499558